Impress your customers all year around with 3D moulded chocolates. RCI member, Chef Brian Donaghy with Tomric Systems shares step-by-step instructions for working with both solid and hollow moulds, plus important considerations when it comes to tempering and cooling.

Start with Good Temper

It seems fairly basic, but before we dive into moulding chocolate, I feel compelled to note that proper moulding techniques all start with chocolate in good temper. Good temper leads to appropriate viscosity (90˚F/32˚c or below for 3D moulding), which ultimately leads to better finished pieces, whether that be your three-foot hollow bunny, your solid chocolate Santa pop or the shell to that beautifully decorated artisan-style praline. We are always looking for bubble-free chocolate, of even thickness throughout the moulded piece with the beautiful shine and snap that will delight our customer. How can we get there?

Solid Moulds

Many 3D moulds are designed as an open or closed format. The open format allows the mould to be made hollow or solid, while the closed format only allows for hollow manufacturing. Solid forming is fairly straight forward; clip the two (or more pieces) together, fill with chocolate, (bubble-free is easier to achieve, if you vibrate the mould while filling) and set filled mould in a cool space with air flow—I prefer 50˚F/10˚C for my refrigeration temperature. Leave the mould there until you can see the chocolate pulling away from the inside of the plastic. If the chocolate piece experiences breakage during this time, I will often remove some of the clips and turn the mould onto its base to finish the crystallization process. Once the piece is ready to be unmoulded, I remove it from the cool space and allow it to return to room temperature before I unmould.  Waiting this little bit, helps to prevent sugar bloom or condensation on the piece. If the mould has flash (chocolate on the seam that slipped between the plastic sides), cut it off with a utility knife or sharp paring knife and then use compressed air or a badger-style brush to remove the excess chocolate.

Hollow Moulds

The process for creating hollow moulded chocolates is similar to the solid, but after filling it while vibrating the mould, set the mould aside at room temperature for a couple minutes. Next, pour the chocolate from the mould back into the temperer. Repeat this process until the piece is the appropriate weight or thickness. Create the bottom of the piece, by pouring tempered chocolate onto a lined sheet pan, slightly bigger than the base of the mould. Stand the mould into that pool of chocolate and place the mould and sheet pan in a cool space. Like the solid piece, remove clips early if there is breakage, and bring the piece back to room temperature before unmoulding. The extra chocolate around the base of the mould can be easily removed prior to opening the mould by placing a knife between the mould and the chocolate, it should just break away if the chocolate is finished crystallizing.

Cooling Time 

What amount of time is best to store chocolates in a cool space before removing the mould? This will depend on a few factors; the size of the mould, how much chocolate the mould uses and the actual temperature of the space. Regardless of these variables, remember that no matter the size, amount of chocolate or room temperature, you will get more consistent results if that space has moving air, because moulding chocolate that has been properly tempered requires heat exchange created by airflow.

Follow this expert advice to achieve bubble-free moulded chocolates with a beautiful shine and snap.

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1. The Blade Test: This method is quick, easy and budget friendly, however the results could vary on the temperature of the room.
   
   Simply dip a metal spatula or knife blade into the chocolate and leave a small film on the blade. At room temperature (65-68° F), well-tempered chocolate should be firm, not tacky, after just five minutes.
2. Tempermeter: Although more costly, this method will most accurately measure the degree of tempering, indicating the quality and quantity of stable crystals that have been formed.
   
   Tempermeters produce a temperature versus time curve, resulting from uniform cooling of a chocolate sample over a specified period of time.